There is a thermal fuse and a bi-metal switch on the side of the element housing, there is also a bi-metal switch on the blower housing and all three can be checked with an ohm meter. The bi-metal switches can be reset by putting them in the freezer, but they will then blow at lower temps so it is a temp fix at best. If it is the fuse it will have to be replaced. Just be sure to check the element at the same time.